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Subjectivism and Economic Analysis: Essays in memory of Ludwig ...

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ENDOGENOUS CHANGEThere is no room <strong>in</strong> this world for <strong>in</strong>dependent <strong>in</strong>vestmentdecisions.In this model <strong>of</strong> a grow<strong>in</strong>g economy the agents who are usuallysupposed to make <strong>in</strong>vestment decisions are passively accept<strong>in</strong>g theequilibrium rate <strong>of</strong> accumulation. Various reasons expla<strong>in</strong> theirbehaviour. Here emphasis is placed on the possibility that <strong>in</strong>vestorshave not yet formed a theory <strong>of</strong> the growth <strong>of</strong> the economy, with theresult that they do not act on that. No theory implies no policy. Thefact that the rate <strong>of</strong> accumulation is determ<strong>in</strong>ed as the rate thatclears the labour market shows that no theory is currentlyenterta<strong>in</strong>ed by entrepreneurs on the variables relevant to theirpotential <strong>in</strong>vestment decisions, like, for example, the rate <strong>of</strong> pr<strong>of</strong>it.Otherwise <strong>in</strong>vestment decisions would be changed accord<strong>in</strong>g tosome established behavioural function. Precisely because <strong>of</strong> theabsence <strong>of</strong> any such behavioural function, equilibrium cannot butbe provisional.If accumulation is supposed to be governed by decisions <strong>of</strong> firms,the equation l<strong>in</strong>k<strong>in</strong>g the rate <strong>of</strong> accumulation with the rate <strong>of</strong>growth <strong>of</strong> the labour force can be replaced by an equation l<strong>in</strong>k<strong>in</strong>gaccumulation with someth<strong>in</strong>g more congenial to firms, such as theexpected rate <strong>of</strong> pr<strong>of</strong>it on <strong>in</strong>vested capital. This replacement is thedist<strong>in</strong>guish<strong>in</strong>g characteristic <strong>of</strong> another regime <strong>of</strong> growth, which hasa clear Keynesian flavour. The set <strong>of</strong> <strong>in</strong>dependent relations to beadded to the common analytical core to obta<strong>in</strong> this case is thefollow<strong>in</strong>g:g s=srK/X=a 1g i=g(r)where g s<strong>and</strong> g irepresent desired sav<strong>in</strong>g <strong>and</strong> desired <strong>in</strong>vestment perunit <strong>of</strong> capital. Aga<strong>in</strong> we have a set <strong>of</strong> <strong>in</strong>dependent relations thatdeterm<strong>in</strong>e the usual set <strong>of</strong> five unknowns. Clearly, the addition <strong>of</strong> afurther relation requir<strong>in</strong>g accumulation to be carried out at the naturalrate would overdeterm<strong>in</strong>e the system. Thus, this particular regime<strong>of</strong> growth implies <strong>in</strong> the general case g¹n. It also implies thatdistribution can no longer be expla<strong>in</strong>ed as the result <strong>of</strong> the marketclear<strong>in</strong>ghypothesis. The rate <strong>of</strong> growth <strong>of</strong> employment <strong>and</strong> <strong>in</strong>comedistribution are turned <strong>in</strong>to residual variables. Individual behaviour<strong>in</strong> the field <strong>of</strong> employment <strong>and</strong> <strong>in</strong>come distribution is not modelledthen: the supply <strong>of</strong> labour is presented as perfectly elastic, the realwage rate is just a consequence <strong>of</strong> entrepreneurs’ <strong>in</strong>vestment decisions.119

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